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p { width: 13em; border: 1px solid black; }
p { white-space: nowrap; }
a { color:pink; }
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<p><span>mmmmmmmmmm</span><br>
<span>mmmmm<a>mmmmm</a></span></p>
<p>m <span>mmmmmmmmmm</span><br>
<span>m<a>mmmmmmmmm</a></span></p>
</body>
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